“How do I install a new battery? I have a Uniden DCX640 cordless phone. It dies on me after about 90 minutes. Do I need a new battery for both phones, or should I buy a battery recharging unit?”
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Hello and thank you for your inquiry. 90 minutes is not a long talk time, so I would suggest that you may want to purchase a replacement battery for your cordless phone. Model #CBC446 is compatible with Uniden DCX640 series phones. This battery has a mAh of 850. The best way to compare a new battery is to compare it to your old battery by the mAh or Wh, which indicate how powerful the capacity of a battery is. Even though this doesn’t give you a run time at least you know if you are getting a battery that is comparable. If you have any further questions, please let us know!
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